Align data on one shared language
Standardize concepts across teams and sources. Keep definitions consistent so analytics and AI outputs stay reliable over time.

Ontology enrichment, built for scalable knowledge models
Design clean, domain-specific ontologies
Structure concepts, entities, and relationships aligned with your business reality.
Enrich automatically from your documents
Detect new concepts, suggest relations, and keep ontologies up to date at scale.
Power trustworthy AI outputs
Use enriched ontologies as a foundation for GraphRAG, search, and analytics, with explainability.
Trusted by leading teams managing large-scale document knowledge.

Structure and control how your systems reason
- Model how concepts connect, interact, and depend on each other
- Turn unstructured data into machine-readable, interpretable knowledge
- Give agents the ability to reason, explain decisions, and act reliably
Unify data across systems and teams
- Align heterogeneous data sources on a shared semantic model
- Maintain consistent definitions across tools, teams, and workflows
- Support interoperable data for more reliable decisions and downstream usage


Power automation and AI with ontologies
- Provide a structured foundation for AI and automated systems
- Let algorithms reason over explicit concepts and relationships
- Drive more reliable automation and operational efficiency
Build your ontology from your data
- Automatically extract concepts and relationships from unstructured sources
- Support common formats such as CSV, TXT, and PDF
- Preserve ontology quality by filtering noise and prioritizing relevant additions

Download our ready-to-use ontologies
Insurance
Access the insurance contracts ontology, a structured, machine-readable model of home and vehicle insurance policies.
Download the full ontology
Drug Approval
Access the Drug Approval ttl file, a ready-to-use ontology mapping US and European requirements for new drug applications.
Download the full ontology
CSRD
Access the CSRD Ontology ttl file, structuring corporate sustainability reports for AI-driven analysis, compliance, and governance insights.
Download the full ontology
AI Regulations
Access the AI Regulation Act Ontology, a structured, machine-readable model mapping the information from EU Artificial Intelligence Act (2024/1689)
Download the full ontology
How it works?
Here's what we offer in four steps:
1. Upload data
Simply upload your datasets.

2. Kickstart ontology & Analyze
Add a few important concepts related to your company and identify areas for ontology enrichment.

3. Enrich
Review and approve suggested enrichments, or customize them to better fit your needs.

4. Apply
Apply the enriched ontology to your projects, gaining deeper insights and improving data understanding.

Trusted by teams like Leroy Merlin to build clean ontologies at scale.
new classes added
Automated ontology enrichment at scale.
“Lettria accelerated our enrichment process and improved recommendation accuracy.”
Frequently Asked Questions
Currently, Lettria operates on a demo-based access model. To explore the platform's capabilities and see how it can benefit your organization, you can request a personalized demo through the website.
No, Lettria is designed as a no-code solution, making it accessible to users without technical backgrounds. The intuitive interface allows users to build and enrich ontologies without the need for programming skills.
By organizing data into structured ontologies, Lettria enables AI systems to reason more effectively and automate tasks. This structured approach leads to smoother operations and increased efficiency across various applications.
Lettria supports a variety of unstructured data formats, including:
- Text documents:
.txt,.docx,.odt,.html - Spreadsheets:
.csv,.xls,.xlsx - PDF files:
.pdf
This versatility ensures that diverse data sources can be effectively transformed into structured knowledge.
Yes, Lettria allows you to import your existing ontologies in standard formats like RDF or OWL. The platform supports editing and navigating between concepts, labels, and relationships, facilitating seamless integration and enrichment.
The process involves four key steps:
- Upload Data: Import your datasets, such as CSV, TXT, or PDF files.
- Kickstart Ontology & Analyze: Introduce key concepts relevant to your organization and identify areas for enrichment.
- Enrich: Review and approve suggested enhancements or customize them to suit your needs.
- Apply: Implement the enriched ontology in your projects to gain deeper insights and improve data comprehension.
Find out more on this article Introducing the Ontology Toolkit.
Lettria Knowledge Studio is a no-code platform designed to help organizations build and enrich ontologies from unstructured data sources. It facilitates the transformation of raw text into structured knowledge, enabling better data understanding and management.
Read more about Lettria
Build clean, reliable ontologies from your data
Used by teams to structure complex data and power GraphRAG, search, and analytics.